Corner-joint.



I. SMALL.

CORNER .I OINT. APPLICATION FILED IULY 25.' 1917.

1,241,042. Patented spt. 25, 1917.

M2 www ktories direct to the consumer.

Jnssn SMALL, on ARLINGTON, MARYLAND.`

CORNER-JOINT.

To all whom t may concern.'

Be it known that I, JESSE SMALL, a citizen of the United States of America, residing in Arlington, Baltimore county, Maryland, have invented certain new and useful Improvements in Corner-Joints, of which the following is a specification. y

Large numbers of window sashes, screen frames, screen doors and the like are shipped knocked down by mail order houses and fac- One of the principal diiiiculties encountered by these concerns inthe sale of such goods is that incident to the provisionl of a corner joint for such frames which can be conveniently set up by the unskilled workman, making a permanent square, neat and rigid joint. The object of the present invention is to provide such a joint for this and other purposes.

A joint embodying my invention 1n its preferred form is illustrated in the accompanying drawing in which- Figure 1 is an elevation of the corner of a window screen to which my joint has been applied;

Fig. 2 is a section of the same on the line 2, 2 of Fig. 1;

Fig. 3 is a section on the line 3, 3 of Fig. 1

Fig. 4 is a section on the line 4, 4 of Fig. l; and

Fig. 5 is an elevation of the metal clamping band which is an important feature of the invention.

Referring to the drawings by numerals, each of which is used to indicate the same or corresponding parts in the different gures, the drawings show the ends of two frame members 1, 2 where they meet to form a corner joint 3. Of these, the frame member 2 is rabbeted at its end at 4 and the end of the frame member 1 is inserted in the rabbet which is of a length equal to the width of such member 1 and extends inward from the end surface 5 of the frame member 2 so that with the sides of the rabbet and the end and. sides of the frame member 2 cut at right angles, a square or rectangular corner is formed. This corner is reinforced and the 1darts held in position by the metal clamping member 7 shown in Fig. 5. This is in the general form or outline of a U with the end or connecting member 8 and the legs, 9, 10 straight or substantially straight, the legs 9 being preferably made comparatively very short though this is not Specification of Letters Patent.

Patented Sept. 25, 191'?.

Application filed July 25, 1917. Serial No. 182,647.

absolutely essential. The legs 9 and 10 arey preferably straight or nearly straight but the leg 9, as shown, is turned slightly outward from the rectangular position, z'. e., from a position at right angles to the base or connecting member 8. The clamping member 7, as shown in Fig. 5, has the base or connecting member 8, the leg 9 and about half of the leg 10 made of half round section, easily understood by reference to Fig. 3. .The upper'half of the leg 10, indicated by reference character 11, is made of a straight, flat band or strap with its outer surface in alinement with the outer edges of the half round section at 8, 9, 10. This forms an offset or shoulder 12 at the center of the leg 10 between the Hat and half round portion. These details are in no wise essential but their description makes easier the understanding of the structure illustrated.-

Referring now to Fig. 1, it will be observed that the frame member l is ypierced by a hole 13 at right angles to the length of the frame member 1 and parallel to the frame member 2. Approximately the center of the hole is in alinement with the inner edge 14 of the frame member 2, the outer edge or outer element of the hole 13 being offset from the bottom of the slot or groove 16 which receives the band 1l just about the width of the shoulder 12. The lower end of the frame member 2 is cut with a short groove 17 having its bottom inclined at 18 as shown and the end surface of the frame member 2 is grooved at 20 as shown from this groove 17 through its inner edge 19, the corresponding surface of the frame member 1 being likewise grooved in alinement at 22.

The illustration shows the sides of the screen grooves at 24 and the groove 17 is at the bottom of this groove though it might be elsewhere.

In setting up the joint, the frame members 1 and 2 being in the relation described and shown in Fig. 1, the U-shaped clamping member 7 is applied by thrusting the leg 10 through the hole 13 so that the band or end 11 becomes seated in the groove 16, the leg 9 entering the groove 17 and the connecting member or base 8 entering the groove 20, 22, as shown. i

By hitting the clamping member a few raps on the base or connecting member 8, the full benefit of the wedge effect illustrated is obtained, the inclined leg 9 sliding over the inclined surface 18 and forcing the legs of -the frame members 1 and 2 together' so that the end of the frame member 1 fits snugly into the rabbet 4.

To further complete the joint, the band or end 11 which is pierced with two screw holes 23, is fastened 'into the slot 16 with screws 25. The spring which has been given to this leg of the clamping member which resists thev tendency to force -the strap 11 into the bottom of the groove 16, gives a desired result, z'. e., makes the joint tight along. the line 4, the spring serving to keep the joint' tight by taking up the shock even though the parts become shrunken.

It will be easily apparent that while the joint as illustrated is applied to the corner of a window screen, it does not require the exercise ofthe inventive faculty to any amount of design .to apply it to a: window sash, screen door, or yto any frame where such a corner joint is required.

I have thus described my invention specifically and in detail in lorder that its nature and operation may be fully understood; however, the specific terms hereinl are used descriptively rather than in their limiting sense and the scope of the invention is dened in the claims:

1. AA corner -joint consisting of two frame members, one rabbeted at the end to receive the end of the other, the inserted end being pierced by a' hole lin alinement with the inner surface of the rabbeted frame member, a U-shaped clamp, one leg of which is passed through the aperture and engages the inner surface of the rabbeted member, and-fthe other leg of which engages the rabbeted member from the opposite side.

2.l A corner j oint'consisting of twoframe' members,l one lrabbeted at the end to receivetheendof the other, 'the inserted end being' pierced by a holeA in alinementrwith the inner surface of the rabbeted fram'e member, a U-shaped clamp, one leg` of which is passed through the aperture and engages the inner surface ofthe rabbeted member, the other leg of the U-shaped clamp engaging the rabbeted' member from the opposite side, the legs ofthe clamp being sprung outward and one of the legs having its inner surface inclined to give a wedge eEect in forcing the'parts together.

Signed by me at Baltimore, Maryland, this 13th day of July, 1917.

- JESSE SMALL.

Witnesses:

ZELLA KUHN, PORTER H. FLAUTT.

GOPS .0f this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington; D. CJ. p 

